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Unread 10-25-2013, 01:46 PM   #1
greenmohawk
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2008 MK Compass 
 
Join Date: Jun 2012
Location: Petawawa, Ontario
Posts: 17
Cooling SYstem Question

Read online that in Chrysler cooling systems there is a small flow through the heater core and radiator even with the thermostat closed, curious if this is true. Debating blocking off some of the grill during winter time to help warm up the engine/cab faster.

Thoughts?

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Unread 10-29-2013, 04:07 PM   #2
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
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Your cooling system allows the waterpump to pump coolant through the heater core at all times when the engine is running,full flow also.No need to block off the grill unless you want to overheat,and yes it will overheat in sub-zero temps with the grill blocked off or partially blocked off.
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Unread 10-30-2013, 09:48 AM   #3
greenmohawk
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After the coolant has gone through the heater-core where does it go from there? does it return directly to the block? or does it go through the radiator first? Wikipedia states that there is flow through the heater core at all times as you said, but after the heater core that flow goes through the radiator so that in the event of a thermostat fails there is still some cooling provided.

I'm aware that overheating is a possible concern, but when it gets to be -35 C I see lots of cars/trucks doing it, it is fairly common for people to block the grill and remove the air intake extension so that the engine is pulling warmer air from inside the engine bay. Simply looking for some more info to help me decide if I want to try it, and if I do I would be carefully watching the temp gauge and could easily pull over and remove it.
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Unread 10-31-2013, 06:48 AM   #4
tjkj2002
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Quote:
Originally Posted by greenmohawk View Post
After the coolant has gone through the heater-core where does it go from there? does it return directly to the block? or does it go through the radiator first? Wikipedia states that there is flow through the heater core at all times as you said, but after the heater core that flow goes through the radiator so that in the event of a thermostat fails there is still some cooling provided.

I'm aware that overheating is a possible concern, but when it gets to be -35 C I see lots of cars/trucks doing it, it is fairly common for people to block the grill and remove the air intake extension so that the engine is pulling warmer air from inside the engine bay. Simply looking for some more info to help me decide if I want to try it, and if I do I would be carefully watching the temp gauge and could easily pull over and remove it.
I'd have to actually look at the engine to tell you that but I know on my 3.7 V6 both heater core lines go to the front cover,one from the WP and the other back into the block.


You already have a small grill opening,blocking off anymore can create a overheating issue very fast. Diesels and large gas trucks benefit from a winter front unloaded as they have massive cooling systems for towing so unloaded they only need 25% or so of there cooling capacity.
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